Rechargeable batteries are not infinite -- and when the lithium-ion battery inside an iPhone is nearing the end of its lifespan, performance suffers. In fact, Apple intentionally reduces the performance on older iPhones in order to prevent shutdowns of a battery that can no longer keep up. This setting is meant to prevent your smartphone from shutting off in your hand, but the setting will also have a detrimental effect on the device's speed.
from Pocket-lint - Phones https://ift.tt/7P4VBEx
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